function val = get(w,prop_name)
   %GET Get waveform properties
   %   val = get(waveform,prop_name)
   %
   %   Valid property names:
   %       CHANNELTAG, NETWORK, STATION, LOCATION, CHANNEL,
   %       CHANNELINFO : (gets the info as a string 'Net.Sta.Loc.Cha')
   %       FREQ, START_STR,
   %       END_STR, DATA, NYQ, PERIOD
   %     also:
   %       START, END : return datenum format (MatLab's format)
   %       START_EPOCH, END_EPOCH : return epoch format.
   %
   %       DATA_LENGTH : return number of elements in data
   %
   %       The following return time duration of data
   %       DURATION_STR :  text format
   %       DURATION: matlab (datenum) format
   %       DURATION_EPOCH : antelope (epoch) format (just # of seconds)
   %
   %       TIMEVECTOR : return a vector of same length as data with
   %                    matlab-formatted times.
   %
   %       MISC_FIELDS: gets a list of fields that were added to this waveform
   %       UNITS : Find out what units the data is in (ex. counts, nm/s)
   %
   %   If waveform is N-dimensional, then VAL will be a cell of the same
   %   dimensions.  If GET would return single-values for the property, then
   %   VAL will be a matrix of type DOUBLE, arranged in the same dimensions.
   %
   %       If additional fields were added to waveform using ADDFIELD, then
   %       values from these can be retrieved using the fieldname
   %
   %       Example: Create a waveform, add a field, then get the field
   %           W = waveform;
   %           W = addfield(W,'P-pick', datenum('1/5/2007 02:12:15'));
   %           misc = get(W,'MISC_FIELDS'); %returns a cell with 'P-pick'
   %           PickTime = get(W,'P-pick'); % (same as) PickTime = get(W,misc);
   %
   %
   %   See also WAVEFORM/GETM, WAVEFORM/SET, WAVEFORM/ADDFIELD,
   %   WAVEFORM/DELFIELD
   
   %  11/28/2008 added WAVEFORM_OBJECT_VERSION, which returns a single version
   %  field from the waveform object.  This is set with the constructor, and
   %  is used in load_obj.
   
   % AUTHOR: Celso Reyes, Geophysical Institute, Univ. of Alaska Fairbanks
   % $Date$
   % $Revision$
   
   
   %global mep2dep
   
   %val_CELL = cell(size(w));
   %val = val_CELL;
   usedcell = false;
   singleWave = isscalar(w);
   switch upper(prop_name)
      
      % IDENTIFICATION PROPERTIES
      case {'STATION','CHANNEL','NETWORK','LOCATION'} %type:CELL
         val = get([w.cha_tag],prop_name);
         usedcell = true;
         
      case {'COMPONENT'} %type:CELL   GRANDFATHERED IN...
         val = get([w.cha_tag],'channel');
         usedcell = true;
         
         % DATA DESCRIBING PROPERTIES
         
      case {'FS', 'FREQ'} %type:DOUBLE
         val = [w.Fs];
         
      case 'DATA' %type:DOUBLE
         if singleWave
            val = w.data;
         else
            val = {w.data}; %cells of data values
            usedcell = true;
         end
         
      case 'NYQ' %type:DOUBLE
         val = [w.Fs] ./ 2;
         
      case 'PERIOD' %type:DOUBLE
         val = 1 ./ [w.Fs];
         
      case 'DATA_LENGTH' %type:DOUBLE
         val = zeros(size(w));
         for N = 1: numel(w)
            val(N) = numel(w(N).data);
         end
         
         % TIME PROPERTIES
         
      case {'START_STR'} %type:CELL
         val = stringDate([w.start]);
         usedcell = true;
         
      case {'START_EPOCH'} %type:DOUBLE
         val = mep2dep([w.start]);
         
      case {'START_MATLAB', 'START'} %type:DOUBLE
         val = [w.start];
         
      case {'END_STR'} %type:CELL
         val = stringDate(grabEndTime(w));
         usedcell = true;
         
      case {'END_EPOCH'} %type:DOUBLE
         val = mep2dep(grabEndTime(w));
         
      case {'END_MATLAB', 'END'} %type:DOUBLE
         val = grabEndTime(w);
         
      case {'DURATION_STR'} %type:CELL
         endvec = grabEndTime(w(:)) - [w(:).start];
         if numel(w) == 0
            val = durationDate(nan);
         elseif singleWave
            val = durationDate(endvec);
         else
            val = cell(size(w));
            for N = 1 : numel(w)
               val(N) = {durationDate(endvec(N))};
            end
            usedcell = true;
         end
      case {'DURATION_EPOCH'} %type:DOUBLE
         val = (grabEndTime(w) - [w.start]) * 86400;
         %epoch time is # of seconds.
         
      case {'DURATION_MATLAB', 'DURATION'} %type:DOUBLE
         val = grabEndTime(w) - [w.start];
         
      case {'TIMEVECTOR'} %type:CELL
         val = cell(size(w));
         for N = 1 : numel(w)
            Xvalues = linspace(w(N).start,get(w(N),'end'),length(w(N).data)+1);
            val{N} = Xvalues(1:end-1)';
         end
         usedcell = true;
         
      case {'MISC_FIELDS'} %type:CELL
         val = {w.misc_fields};
         usedcell = true;
         
      case {'UNITS'} %type : CELL
         val = {w.units};
         usedcell = true;
         
      case {'WAVEFORM_OBJECT_VERSION'}
         val = w(1).version;
         
      case {'SCNLOBJECT'} % legacy only
         % I'm making this whiny for now so it is obvious when things need to
         % be changed.  This warning should probably be pulled out once we
         % rerelease this.
         warning('waveform:get:scnlobjectsAreDepricated',...
            ['any usage of scnlobject should be replaced by ', ...
            '''channelinfo'' which uses the new ChannelTag class']);
         val = scnlobject([w.cha_tag]);
         %must add network & location, too.
         
      case {'CHANNELTAG'}
         val = [w.cha_tag];
         
      case {'CHANNELINFO'}
         val = string([w.cha_tag]);
         
      case {'HISTORY'}
         val = cell(size(w));
         for n=1:numel(w)
            val(n) = {w(n).history};
         end
         usedcell = true;
         
      otherwise
         %perhaps we're trying to get at one of the miscelleneous fields?
         val = cell(size(w));
         for n = 1 : numel(w)
            %loc is the position...
            %w(n).misc_fields should ALWAYS already be in uppercase
            mask = strcmp(upper(prop_name),w(n).misc_fields);
            %fieldwasfound = any(mask);
            %[fieldwasfound, loc] = ismember(prop_name, w(n).misc_fields);
            if any(mask)
               
               val{n} = w(n).misc_values{mask};
               %val{n} = w(n).misc_values{m};
            else
               error('Waveform:get:unrecognizedProperty',...
                  'Unrecognized property name : %s',  prop_name);
            end
         end
         %check to see if value can be returned as a numeric value instead
         %of cell.  Only if all values are numeric AND scalar
         numberize = true;
         for n=1:numel(val)
            if ~(isnumeric(val{n}) && isscalar(val{n}))
               numberize = false;
               usedcell = true;
               break
            end
         end
         if numberize,
            Z = val;
            val = nan(size(Z));
            for n=1:numel(Z)
               val(n) = Z{n};
            end
         end
         
   end;
   if (numel(val) == numel(w)) %THIS TEST CONDITIONALIZED 4/16/2008
      val = reshape(val,size(w)); %return values in proper shape
   end
   if usedcell && singleWave
      if isa(val,'cell')
         val = val{1}; % return the actual value, not a cell array
      end
   end;
end
%%%%%%%%%%%%%%%%
function val = grabEndTime(w)
   if isempty(w)
      %val = [];
      val = w.start;
      return
   end
   dlens = get(w,'data_length');
   dlens = dlens(:);
   
   myfrq = [w.Fs];
   myfrq = myfrq(:);
   
   seclen = dlens ./ myfrq;
   to_add = datenum([zeros(numel(w),5) seclen])';
   svals = [w(:).start];
   val = svals +  to_add;
   
   %endvec = datevec([w.start]) + [0 0 0 0 0 length(w.data)/w.Fs];
   %endvec = datevec([w.start]) + [0 0 0 0 0 get(w,'data_length') ./ get(w,'Freq')];
   %val = datenum(endvec);

end
%%%%%%%%%%%%%%%%
function val = stringDate(myDate)
   if isnan(myDate)
      warning('waveform:get:undefinedDate','Undefined date');
      val = 0;
      return
   end
   val = datestr(myDate,'yyyy-mm-dd HH:MM:SS.FFF');
end
%%%%%%%%%%%%%%%%
function val = durationDate(myDate)
   
   if isnan(myDate)
      %this likely happened because the frequency was undefined (NaN)
      val = '';
      return;
   end
   
   myDate = myDate(:);
   [yr, mo, da] = datevec(myDate);
   val = '';
   %if yr, val = [val sprintf('%2d years ',yr)]; end
   %if mo, val = [val sprintf('%2d months ',mo)]; end
   if (yr+mo+da)>1,
      val = [val sprintf('%4d days ',fix(myDate))];
   end
   val = [val datestr(myDate,'HH:MM:SS.FFF')];
end
